Tussock /(?)/

Tus·sock

Tussock

n.
  1. A tuft, as of grass, twigs, hair, or the like; especially, a dense tuft or bunch of grass or sedge.
    Such laying of the hair in tussocks and tufts.
  2. Same as Tussock grass, below. (Bot.)
  3. A caterpillar of any one of numerous species of bombycid moths. The body of these caterpillars is covered with hairs which form long tufts or brushes. Some species are very injurious to shade and fruit trees. Called also tussock caterpillar. See Orgyia. (Zool.)

Phrases & Compounds
Tussock grass
A tall, strong grass of the genus Dactylis (Dactylis caespitosa), valuable for fodder, introduced into Scotland from the Falkland Islands.
Tussock moth
the imago of any tussock caterpillar. They belong to Orgyia, Halecidota, and allied genera.